9. Vanilla Ice Cream
Made fresh and home, true ice cream contains milk, sugar, cream, eggs, and flavoring. Of course, mass-produced ice cream has got to be done differently, so grocery store ice cream may contain a stabilizer called castoreum.
No big deal, but you probably want to know that castoreum is secreted from the anal glands of beavers. Not to worry, though, this product is unsurprisingly difficult to harvest, so it is not used very widely.